Let a and b be two non-zero vector perpendicular to each other and | a |=| b |. If | a b |=| a |, then the...

Question

Let a and b be two non-zero vector perpendicular to each other and | a |=| b |. If | a b |=| a |, then the angle between the vectors ( a + b +( a b )) and a is equal to :

Accepted Answer

(B)

JEE Main 2021 Mathematics question

Solution